Faulty advertising

The Patagonia Store does not accept exchanges of Patagonia merchandise without proof of purchase, even if they carry the exact same product!! I had to wait over 25 minutes for a manager to be told that even though they had the exact article of clothing in the size I was hoping to exchange for, they would not exchange it (the clothing that was trying to exchange even had the tags still on!!)! Terrible customer service. I will never shop at this store. I would much rather support Patagonia by buying directly.